What fork seal fits a KTM 105 SX?

The KTM 105 SX uses a 43 mm conventional fork with 43x53x9.5 oil seals. We stock the manufacturer-verified seal and bushing kits for it; matching is done off the verified application list, not just the seal size.

What size is the KTM 105 SX fork?

The KTM 105 SX has a 43 mm conventional fork with 43x53x9.5 oil seals.

Can I use any seal with the same dimensions?

No. Fork seals can share a size and still not seat correctly in a different fork design, so use the seal verified for your bike. The kits listed here are confirmed by the manufacturer to fit the KTM 105 SX.

KTM 105 SX Fork Seals

Q: What fork oil does the KTM 105 SX use?

The KTM 105 SX uses 4wt fork oil (factory fill WP/KTM Fork Oil SAE 4 (48601166S1)).

The KTM 105 SX runs a 43 mm conventional front fork, oil seal 43x53x9.5 (WP 43mm conventional damper-rod (BMW F800GS 2013-2017)).Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.

Fork tube43 mm
Oil seal size43x53x9.5
Fork typeConventional
ForkWP 43mm conventional damper-rod (BMW F800GS 2013-2017)

Kit	Years	Seal size	Replaces OEM
55-114	2004–2011	43x53x9.5	KTM 43570623, KTM R14049
57-137	2004–2011	n/a	n/a
56-126	2004–2011	n/a	n/a
38-6052 (bushings)	2004–2011	n/a	n/a

Verified fork kits we stock for your KTM 105 SX

Fork Seal Kit

Fork Dust Seal Kit — BMW F800GS (2013-2017) +

$21.01

Fork Seal Kit

Fork Oil & Dust Seal Kit — Gas-Gas EC125 (2003)

$39.78

Fork Bushing Kit

Fork Bushing Kit — KTM SMT 890 (2023-2024) + 6

$62.99

Fork oil for your KTM 105 SX

A fork-oil change on the KTM 105 SX uses 4wt fork oil. Factory fill: WP/KTM Fork Oil SAE 4 (48601166S1). We don't stock 4wt yet, so the closest weight we carry (5wt) is shown below.